Mold structure



Sept. 18 1923.

B. A. KNUDSON MOLD STRUCTURE Filed Aug. 19. 1922 JJYVEZYTQZZ Bar/75 a v NZ T T A Patented Sept. l 1923.

e a s Fri ant ne if Banners. Karo-neon, or sense ens, CALIFORNIA.

new sr'aucruns.

Application filed angs -19, lees. Flerial no. 5543,013

r all'ichoin it may concern 7 a Be it known thatfjL' Banner A. Krrrnoson,

"a citizen of the United States, residing at Santa Ana in the county of Orange and State of Californimhave lnvented new and useful Im rovements. in Mold Structures of which the following is a specification.

This invention relates to apparatus for molding concrete walls and other structures and has for its object toprovide an extremely simple, practicable, substantial and economical form of knock-down and resetviceable concrete molding means.

Another. object i to provide a molding structure adapted to be readily installed in different mold boards so as to form during operation a hollow wall or a wall having vertical tally.

Other objects and advantages will be made manifest in the following specifica tion or" an embodiment of the invention illustrated in the accompanying drawings, wherein: p g

Figurel is a perspective of one adaptation of the invention.

Figure 2 is a sections.

The invention consists of a set of mold or core members adapted to'be arranged within exterior mold boards or panels 2 and 3 which are spaced a suitable distance according to the thickness of the desired wall. The core forming members include inner planks 4 and 5 of any suitable length according to the width of a chamber to be produced in the wall and of suitable height; a practicalheighth of the core planks l and 5 being about'one. foot as this enables the casting of a foot at each step and then the rearrangement and elevation of the core means progressively during the erection of the wall.

Across the upper ends of the core planks 4: and 5 are arranged cross pieces 6 which have vertical apertures 7 through which may be passed dowel or gauge pins 8 which extenddown inside of the mold boards 2 and 8 to define the position of these boards laterally. At the ends of the core planks are uprights 9 through which pass bolts 10 securing the cross bars 6 in place.

The upperends of the uprigths 9 are transversely slotted as at 10 and in the erection of a concrete wall W, 1n which are passage-ways separated horizon-V plan of one of the end mold to be formed vertical passageways or vent projecting flanges 12 beyond which project This forms inwardly extendinglips 13. right angular seats along the edges of the end'piece llrand these seats are adapted to be applied to the corner posts 9 at respective ends of the core planks i and 5.

It will be seen therefore, that these planks and the applied end pieces 11 form a substantial core of suitable dimensions and suitably spaced within the mold boards 2 and 3, and which space is adapted to be filled with tamped concrete to form the wall N. The end pieces are held in position by passing cross pins through apertures in the tops of the cross pieces and then lowering the pins 14 into the cross slots 10 in the tops of the corner posts 9.

'From this it will be seen that when a course of mold boards 2 and 3 have been arranged along or around the wall contour or upon a foundation, then the removable core forming members can be readily inserted between the mold boards and properly positioned by the dowel pins 8.

After the necessary number of core structures'have been installed around the wall being prepared, then the plastic cement is poured in and tamped and when it has suiiiciently hardened the temporary cores are removed by unpinning the end pieces as to close the ends of the chamber between the planks, said end pieces consisting of semi-cylindrical sheet-metal shells fitting the ends of the core planks, the longitudinnl'edges of the core end shells'ha-ving in- V Wardly turned'fianges forming seats to abut against the ends of-the-core planks, V 2. A knock-down mold devlce :for con- Crete mold processegeomprising inner core planks, means for supportlng the planks 1n spaced relation between mold boards, end

pieces applicable to the eore planks so ,as

to close the ends of the chamber between the planks, said end pieces consisting of Semtc'ylindrleal membets fittingthe ends of the eoref'planks, the QQlffPlaIIkShaYlingi wardly extendin cerner posts with slots m I the tops thereon and astening} pins for l at-tziching thecol e endsg t-p sai d corner pests and which pins are ada ted to seat in sa icl slots. V V 

